arm64: dts: ti: k3-am64-mcu: Fix the compatible string in GPIO DT node

Fix the compatible string in mcu domain GPIO device tree node.

Fixes: 01a91e01 ("arm64: dts: ti: k3-am64: Add GPIO DT nodes")
Signed-off-by: NAswath Govindraju <a-govindraju@ti.com>
Reviewed-by: NLokesh Vutla <lokeshvutla@ti.com>
Signed-off-by: NNishanth Menon <nm@ti.com>
Link: https://lore.kernel.org/r/20210423060133.16473-1-a-govindraju@ti.com

arch/arm64/boot/dts/ti/k3-am64-mcu.dtsi

@@ -87,7 +87,7 @@
 	};
 
 	mcu_gpio0: gpio@4201000 {
-		compatible = "ti,am64-gpio", "keystone-gpio";
+		compatible = "ti,am64-gpio", "ti,keystone-gpio";
 		reg = <0x0 0x4201000 0x0 0x100>;
 		gpio-controller;
 		#gpio-cells = <2>;